Speaker connection for talking-machines.



F. O. KENT 81 C. W. LINDHOLM. SPEAKER CONNECTION E'uu 'r/mumu MAuHIMts.

APPLICATION FILE-I MAY 27.1914

Patented Mar 1915.

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5 EHEETS SHEET 1 I I INVENTURS P. G. KENT & G. W. L'INDHOL'M. SPEAKERCONNECTION FOR TALKING MACHINES.

AIILIOAllON LILIJDMAY 27. 1914 I Patented Mar. 2, 1915.

2 SHEETS SHEET 2v WIT NE 88158: IPJE'EN T083 AUQRNEY.

Fenian-men ('1. near AND cant WILLIAM LINDHOLM, or newness, new JERSEY.

SPEAKER CONNECTION FOR TALKING-MACHINES.

Specification of "Letters Ea'tent.

Patented Mar. 2?, 191.5

a naaaon men ma 27, 191 2. Serial No. semen.

iication.

Of the various talkingmachines now on the market there are two popularmakes, one

of which employs record disks from which sound waves are produced by thebearing of a needle on the side wall of a spiral groove 1 in the recorddisk, while the other produces sound waves by a stylus bearing upon thebottom of the groove. Obviously," record disks manufactured to be playedupon one make of machine will not play upon the other, and vice versa.

The present invention relates, therefore, more particularly to means foradapting a machine which normally plays records by the stylus bearing onthe bottom of the groove, to play records in which a needle bears on theside wall of the groove, and the objectsor" the invention are to providean efiicient device of this character; to enable the device to bereadily applied to or removed from the machine; to allow for verticaland lateral displacement; to secure simplicity of construction andoperation, and to obtain other advantages and results I as may bebrought out in the following description.

Referring to the accompanying drawings,

in which like numerals of reference indicate the same parts throughoutthe several views, Figure 1 is a plan of a portion of a talking machinenormally adapted to employ a stylus bearing on the bottom of the recordgroove, with our invention applied to enable its stylus te bear upon theside of a record groove; Fig. 2 is a vertical sectional viewlongitudinally through the tone arm there" of; Fig. 3 is a section online A-A of Fig. 2; Fig. 41 is a similar sectional view showing theparts separated; Fig. 5 IS a sectional view online 13-13 of Fig. 3; Fig.6 is a perspective view of our device detached from the machine, andFig. 7 is a perspective view of the reproducer mounting.

In the specific embodiment of the invention illustrated in saiddrawings, the reference numeral l-indicates a-tone arm secured upon anupright pivot rod 2 and adapted to swing; horizontally over a revolvingtable- C KENT 3 and record 4 thereon, in substantially parallel relationthereto. The particular machine here shown includes an axiallyhorizontal worm wheel 5 adjacent the lower end of the pivotrod adaptedto rotate in synchronism with the table. A radial arm 6 secure-die thepivot rod 2 projects over the worm wheel 5 and is threaded at its end tomesh thgrewith. vVith the worm wheel rotating. it will-be obvious thatthe tonearm will be swung gradually across thetable. The pivoted end ofthe tone-arm connects with an amplifying horn 7, being shown integraltherewith.

Our device is adapted to be applied to the end of the tone-arm whichoverlies the record and for this purpose provides a neck 8 adapted to beinserted in the tubular end of the tone-arm in the same way'that theneck of a reproducerwith a stylus adapted to engage the bottom of therecord groove is inserted. For holding said neck in place, the tone-armis slotted inwardly from its end as at 9, and around this slotted end isa collar 10 having a bayonet-joint slot 11 opening toward the free endof the tonearm. This collar is prevented .from longitudinal movement byany suitable means, such as the flange 12 on the end of thetonearm andthe pin 13 at the opposite side of the collar, and has a rotary movementlimited by said pin 13 engaging the ends of a recess 14: in the edge ofthe collar sufficient to admit of registration of the opening of thebayonet-joint slot 11 and the slot 9 in the tone-arm and yet allow thecollar to be turned so that the inner end of the bayonetjoint slot 11will register with the inner end of the slot 9 in the tone-arm. Aradially projecting pin 15 on the neck 8 admits of the neck beinginserted in the tone-arm when said pin enters the registering slots,

. and then as the collar 10 is turned the pin enters farther into thestraight slot 9 of the tone-arm and to the inner end of thebayonet-joint slot 11. In this manner the neck 8 is prevented fromeither turning or sliding out. and yet'can be readily andquicklyreleased by turning the collar 10 back to bring the open ends of theslots 9, 11 into registration.

It is to be understood that the neck 8 is hollow, providing an interiorpassage 16 for transmitting the sound waves. The end of the neck awayfrom the tone-arm preferably turns downward at substantially rightangles, as at 17, and has its extremity ina plane substantially parallelto the table andrecord, above the same. An elbow 18 is rotatably carriedat this end of the neck 8 with its interior passage 19 in continuhtionof the interior passage 16 of the neck.' In order to pivotallytmount theelbow 18 on the neck 8, we have shown the neck reduced in diameteradjacent its end and the reduced portion 20 inserted in the upper end ofthe elbow, (see Figs. 3 and 4). A peripheral groove 21 is out in theouter surface of the reduced portion 20 and a corresponding groove 22 iscut around the interior surface of the elbow to register with the groove21 of the neck. Furthermore, said groove 21 in theneck is cut deeperthan the groove 22 in the elbow, so that in assembling the parts a roundwire expansion spring 23 may be pressed into the groove 21 of theneckuntil the grooves register, when the spring will. spread and part of itwill lie in the groove 22 of the elbow and part will lie in the .groove21 of the neck. Obviously, the elbow will then be free to revolve withrespect to the neck and yet they will be connected against anyseparationlikely to occur in ordinary usage.

Projecting from the end of the elbow which is substantially horizontalin use is the reproducer tube 2% which preferably comprises a tubehaving end portions 25, 26 bcntsubstantially parallel and in the samedirection but separated by a middle portion 27, which we have shownstraight although it might be otherwise, (see Fig. 7). The end ortion25, which enters the elbow, has a slot 28 extending circumferentiallypart of the way around itself and a screw 29 projects into this slotfrom the elbow, thus allowing a limited turning of the repro ducer inthe elbow, but holding said tube and elbow from separating, (see Fig. 5)The opposite end portion 26 carries the usual sound reproduccr 30 whichhas a needle to engage the side of the spiral groove in the record.

It will be understood that whereas the phonograph shown is usuallyemployed with a reproducer applied directly to the end of the tone-armand having a stylus adapted to engage the bottom of a record groove, ifit is desired to play a record of the other kind our improved device isapplied to the tonearm carrying a reproducer with a stylus.

adapted to engage the side wall of the groove, all as shown in thedrawings. When this is done the r tatable connection between the neck 8and elbow 18 which permits swinging upon a vertical axis enables thetone-arm to move slower than the reproducer, as is necessary when arecord of the other kind is played upon a machine of the type shown, andfurthermore the swivel connection between the reproducer tube at and theelbow 18 permits vertical movement of the reproducer.

Obviously detail modifications may be made in manufacturing our improvedspeaker connection for talking machines without departing from thespirit and scope of the invention, and we do not wish to be understoodas limiting ourselves except as required bythe following claims whenconstrued in the light of the prior art.

Having thus described the invention, what we claim isi 1. A speakerconnection for talking machines comprising in combination a tubularneck-piece having one end adapted to receive the tone-arm of a talkingmachine and the ,other end directed downward, a tubular I elbowtelescopically receiving said downward end of the neck-piece, theoverlapping portions of said elbow and neck-piece having oppositegrooves, a spring ring in said grooves, preventing separation of theparts while permitting relative rotation, and a reproducer tuberotatably connected to the other end of said elbow to swing in anupright plane.

'2. In combination with a talking machine having a revolving table and atone arm open. longitudinally at one end, of a neck having a portionadapted to receive said open end of the tone arm longitudinally andanother portion. turning downward adjacent said end of the tone arm, anelbow supported at the lower end of said neck free to turn with respectthereto in a plane parallel to said table and having its lower endopening laterally of the'tone arm, a reproducer tube in the laterallyopening end of said elbow free to be turned therein, and a reproducer atthe outer end of said reproducer tube.

3. In combination with a talking machine having a revolving table and atone arm open longitudinally at one end, of a neck having a portionadapted to receive said open end of the tone arm longitudinally andanother portion turning downward adjacent said end of the tone arm, anelbow supported at the lower end of said neck free to turn with respectthereto in a plane parallel to said table and having its lower endopening laterally of the lone arm, a reproducer tube in the laterallyopening end of said elbow free to be turned therein, a reproducer at theouter end of said reproducer tube, and means for retaining said neckconnected to said tone arm and preventing rotation thereof.

Witnesses:

HOWARD P. KING, JANET A. Areas.

